Ibrahim Manal, Tashkandi Nada, Hadjichristidis Nikos, Alkayal Nazeeha S
Chemistry Department, Faculty of Science, King Abdulaziz University, BOX 80203, Jeddah 21589, Saudi Arabia.
Physical Sciences and Engineering Division, Polymer Synthesis Laboratory, KAUST Catalysis Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia.
Polymers (Basel). 2022 Mar 11;14(6):1136. doi: 10.3390/polym14061136.
Studying the effect of functional groups on the porosity structure and adsorption efficiency of polymer materials is becoming increasingly interesting. In this work, a novel porous polyaminal-linked polymer, based on naphthalene and melamine (PAN-NA) building blocks, was successfully synthesized by a one-pot polycondensation method, and used as an adsorbent for both CO and heavy metals. Fourier transform infrared spectroscopy, solid-state C NMR, powder X-ray diffraction, and thermogravimetry were used to characterize the prepared polymer. The porous material structure was established by field-emission scanning electron microscope and N adsorption-desorption methods at 77 K. The polymer exhibited excellent uptake of CO, 133 mg/g at 273 K and 1 bar. In addition, the adsorption behavior of PAN-NA for different metal cations, including Pb(II), Cr(III), Cu(II), Cd(II), Ni(II), and Ba(II), was investigated; a significant adsorption selectivity toward the Pb(II) cation was detected. The influence of pH, adsorbent dose, initial concentrations, and contact time was also assessed. Our results prove that the introduction of naphthalene in the polymer network improves the porosity and, thus, CO adsorption, as well as the adsorption of heavy metals.
研究官能团对聚合物材料孔隙结构和吸附效率的影响正变得越来越有趣。在这项工作中，通过一锅法缩聚成功合成了一种基于萘和三聚氰胺（PAN-NA）结构单元的新型多孔聚胺连接聚合物，并将其用作CO和重金属的吸附剂。采用傅里叶变换红外光谱、固体13C核磁共振、粉末X射线衍射和热重分析对制备的聚合物进行了表征。通过场发射扫描电子显微镜和77K下的N2吸附-脱附方法确定了多孔材料的结构。该聚合物对CO表现出优异的吸附性能，在273K和1bar下为133mg/g。此外，研究了PAN-NA对不同金属阳离子（包括Pb(II)、Cr(III)、Cu(II)、Cd(II)、Ni(II)和Ba(II)）的吸附行为；检测到对Pb(II)阳离子有显著的吸附选择性。还评估了pH值、吸附剂剂量、初始浓度和接触时间的影响。我们的结果证明，在聚合物网络中引入萘可改善孔隙率，从而提高CO吸附以及重金属吸附。
